JP4080214B2 - Drill chuck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drill chuck including a chuck body (main part of the chuck) that can be connected to a drilling spindle.
[0002]
[Prior art]
A plurality of gripping jaws for forming a receiving part for a drilling tool are guided to a guide receiving part disposed at an inclination with respect to the chuck shaft in the chuck body. In order to open and close the drill chuck, these jaws are meshed with a single threaded ring (threaded ring) in which the teeth arranged on the jaw shaft are rotatably guided by the chuck body. Yes. A spring ring is disposed adjacent to the threaded ring and on the drilling tool side viewed from the axial direction.
[0003]
In such a drill chuck, a plurality of gripping jaws are moved in the longitudinal direction of their guide receiving portions. In the guide receiving part, the threaded ring is caught directly or indirectly by a clamping sleeve assigned to the threaded ring. Then, the chuck body is rotated by the drilling spindle of the drilling device. When the drilling spindle rotates in the rotation direction corresponding to the opening of the drill chuck, the plurality of gripping jaws are moved axially rearward in the respective guide receiving portions. Such movement can be performed with a force based on the increasing output intensity of the drilling device. Therefore, in particular, when the flat surface formed at the end of the dentition in the gripping jaws hits the threaded ring, the plurality of gripping jaws are connected to the threaded ring and the guide receiving portion at these rear limit positions. It is fixed in between.
[0004]
In order to avoid such biting, the following has already been proposed. Assign a spring ring to the threaded ring. When the gripping jaw moves rearward, the spring ring is tightened to generate a restoring force that opposes the biting operation. Such drill chucks are basically proven.
[0005]
[Problems to be solved by the invention]
However, in a drilling device having a large output, particularly when the drilling device can be used for a spindle stop function, an operation situation in which the biting and fixing is reached despite the provision of a spring ring can be considered.
[0006]
Therefore, the problem that forms the basis of the present invention is to ensure that the drill chuck is re-closed from the state where the gripping jaw is in the axial rearward limit position as described at the beginning. Is to configure.
[0007]
[Means for Solving the Problems]
Such a problem is solved by the following in the drill chuck as described at the beginning. A spring ring is mounted in the chuck body so as to be freely rotatable. In addition, when the gripping jaw is in the axial rearward limit position between the threaded ring and the spring ring, the cup that non-rotatably connects the threaded ring and the spring ring when the spring ring is bent and deformed. A ring mechanism is configured. Furthermore, means are provided for limiting the angle of rotation between the jaw and threaded ring after the threaded ring and spring ring are connected.
[0008]
The advantages obtained by the present invention are as follows. Not only is the spring ring tensioned by the position / posture shift to generate a return force, but at the same time, an integral fixed rotation is formed between the spring ring and the threaded ring. They can only be rotated relative to the chuck body in a restricted manner in the direction of rotation corresponding to the opening of the drill chuck. This ensures that the thread connection between the threaded ring and the dentition is not over-tightened and automatically locked.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to a preferred embodiment, the coupling mechanism has a cam-like bulge on the threaded ring side of the spring ring. The cam-like bulging portion may be able to enter the cam-like bulging portion receiving portion configured in the threaded ring when the gripping jaw hits the spring ring when the gripping jaw moves backward. Assumed.
[0010]
This embodiment is prominent in the following points. A coupling mechanism can be realized simply by changing the shape of the existing components. Therefore, such a coupling mechanism does not increase the assembly cost of the drill chuck.
[0011]
In particular, if the threaded ring is divided and inserted into a groove extending in the circumferential direction of the chuck body, the cam-like bulge and the cam-like bulge receiving part It is preferable to provide a plurality. This is because each part of the threaded ring can be connected to the spring ring.
[0012]
In an embodiment of the present invention, which is preferable for simplifying the configuration, the means for limiting the rotation angle is formed on the spring ring by a stop cam-like bulge portion which is configured on the axially forward side. It is characterized by that. In this embodiment as well, a further advantage of limiting the rotation of the threaded ring relative to the jaws is obtained simply by changing the shape of the spring ring.
[0013]
Here, it is assumed that several stop cam-like bulges are evenly distributed over the entire circumference so as to correspond to the angular distribution of the jaws. All the gripping jaws are integral with the means for limiting the rotation angle between these gripping jaws and the threaded ring, and correspondingly the individual configurations when the means for limiting the rotation angle are used. This is because the load acting on the member is reduced.
[0014]
In another preferred embodiment of the present invention, the threaded ring is pressed and supported from the chuck via a thrust ring toward the rear in the axial direction, that is, toward the drilling spindle. The threaded ring is in contact with the main body shoulder on the front side in the axial direction of the chuck body. The transverse dimension of the body shoulder is characterized in that it causes a maximum of 50% overlap with the thrust ring from the radial direction.
[0015]
Such a configuration provides the following advantages. When the gripping jaw is moved rearward in the axial direction, the threaded ring is thrust ringed at the moment when the flat surface of the gripping jaw is pressed and supported rearward in the axial direction by the threading ring via the spring ring. Can be deformed backwards. As a result, the thrust ring is given a spring action, which promotes the function of the thrust ring. After the movement of the gripping jaws, the thrust ring tries to return to its normal state, so that the threads of the threaded ring are not pressed against the abutment surface against the teeth of the gripping jaws, but instead of these threads. This is because play is formed in the connection and biting is prevented.
[0016]
If the pressing and support against the chuck body remains large enough, the thrust ring is particularly well-suited when the transverse dimension of the body shoulder corresponds to a maximum of 25% overlap with the thrust ring. Deformation can be performed.
[0017]
In addition, it is preferable that a sliding surface for the ball of the ball bearing is formed on the opposite side of the thrust ring and the threaded ring. When using ball bearings, when tightening or loosening a tool or workpiece, a particularly large force can be applied to the threaded connection between the threaded ring and the jaw jaw. This is because the advantage of the spring member in the power transmission chain is particularly great in the case of such a drill chuck embodiment.
[0018]
In the following, the invention will be described in detail by means of an embodiment depicted in the drawings.
[0019]
FIG. 1 shows a drill chuck. In the chuck body 1 provided in the drill chuck, a spindle receiving portion is formed at the rear end portion in the axial direction. With this spindle receiving portion, the drill chuck can be fixed to a drilling spindle (not shown) in the same manner in a drilling device (not shown). In the chuck body 1, a plurality of gripping jaws 3 that form a receiving portion for a drilling tool are guided in a guide receiving portion 2 that is inclined with respect to the chuck shaft.
[0020]
In order to open and close the drill chuck, these jaws 3 engage with a threaded ring 6 in which a tooth row 5 formed on the jaw shaft 4 is rotatably guided by the chuck body. In the illustrated embodiment, the threading ring 6 is configured as a divided threading ring 6, and after being inserted into a circumferentially extending groove 7 in the chuck body 1, one ring-shaped sleeve 8. It is summarized by.
[0021]
In addition, the threaded ring 6 is connected to a tightening sleeve 9, which can be grasped when the gripping jaw 3 is moved in the guide receiving portion 2. The movement of the gripping jaw is performed by the operation of the drilling spindle. By this operation, the chuck body 1 and the threaded ring 6 are relatively rotated, and the gripping jaw 3 is moved.
[0022]
Adjacent to the threaded ring 6, a spring ring 10 is arranged on the side of the drilling tool viewed from the axial direction. The spring ring 10 is mounted in the chuck body 1 so as to be freely rotatable. A coupling mechanism 11 is configured between the threaded ring 6 and the spring ring 10. The coupling mechanism 11 non-rotatably connects the threaded ring 6 and the spring ring 10 when the spring ring 10 is deformed when the gripping jaw 3 reaches the limit position in the axially rearward direction. The coupling mechanism 11 comprises a plurality of cam-like bulging portions 12 on the threaded ring 6 side of the spring ring 10. These cam-shaped bulges 12 are formed by the gripping jaw 3 abutting against the spring ring 10, in particular, when the flat surface 13 formed along the radial direction at the end of the tooth row 5 abuts against the spring ring 10. When the gripping jaw 3 moves rearward, it can be guided into the cam-shaped bulge receiving portion 14 formed in the threaded ring 6.
[0023]
Furthermore, means for limiting the rotation angle between the gripping jaw 3 and the threaded ring 6 after the threaded ring 6 and the spring ring 10 are connected is provided. This means comprises a plurality of stop cam-like bulges 15 formed on the axially forward side of the spring ring 10. In particular, when the threaded ring 6 is configured to be divided, the plurality of stop cam-like bulging portions are evenly distributed over the entire circumference and correspond to the angular distribution of the gripping jaw 3. Arranged.
[0024]
In one embodiment of the drill chuck shown in FIG. 5, the threaded ring 6 is supported by the chuck body 1 via the thrust ring 16 from the axially rear side, that is, from the drilling spindle side. The thrust ring 16 abuts against a main body shoulder 18 facing forward in the axial direction of the chuck body 1. The transverse dimension of the main body shoulder 18 overlaps the thrust ring 16 up to 50%. In the illustrated embodiment, 25% overlap is performed. In other words, the main body shoulder 18 overlaps an area of 25% of the transverse dimension of the thrust ring 16.
[0025]
A sliding surface for the ball 17 of the ball bearing 19 is formed on the thrust ring 16 and the threaded ring 6 facing each other.
[0026]
The functional aspects of the present invention will be briefly described below. Starting from a state in which the gripping jaws 3 are other than the axially rear limit position, in particular, a state in which the shaft of the drilling tool is at least one of being clamped or guided between the gripping jaws 3. In order to open the drill chuck, the clamping sleeve 9 is gripped, and the chuck body 1 or the drilling spindle is rotated in a rotational direction corresponding to the opening of the drill chuck. Accordingly, the gripping jaw 3 is moved rearward in the axial direction in the guide receiving portion 2 for the gripping jaw 3. When the flat surface 13 of the gripping jaw 3 comes into contact with the spring ring 10 due to the movement in the rearward in the axial direction, the spring ring 10 is tensioned and a restoring force is generated. In order to continue the backward movement of the gripping jaw 3, the threaded ring 6 is rotated with respect to the spring ring 10 until the cam-like bulging portion 12 can be engaged with the cam-like bulging portion receiving portion 14. As a result, the threaded ring 6 and the spring ring 10 can be rotated together thereafter. Such rotation is performed with the chuck body 1 when the drilling spindle is subsequently operated, and the stop cam-like bulging portion 15 comes into contact with the gripping jaw 3 to prevent subsequent rotation. Up to the chuck body 1. Since the spring ring 10 is in a tightened state after the rotation of the drilling spindle, the flank surface on the rear side of the tooth row 5 of the gripping jaw 3 is not pressed against the thread slope of the threaded ring 6. A play between the normal thread slopes will be formed. This play helps to close the drill chuck anew. Such a structure for play in the connection between the flank surfaces of the dentition and the threaded portion is further facilitated by the thrust ring 16 being spring-flexible. In particular, the thrust ring 16 comes into strong contact with the threaded ring 6 by the power-driven drilling spindle when the gripping jaw 3 moves rearward in the axial direction. When it is transmitted to the thrust ring 16 and the chuck body 1 through the cutting ring 6, it is deformed. After the tightening sleeve 9 is loosened, the thrust ring 16 is no longer applied to the jaw 3 and returns to its original position and posture when the entire system is loosened. Two spring-flexible members that are adapted to different load systems with different spring characteristic curves may be used in the drill chuck.
[0027]
【The invention's effect】
Not only is the spring ring tensioned by the position / posture shift to generate a return force, but at the same time, an integral fixed rotation is formed between the spring ring and the threaded ring. This prevents the threaded connection between the threaded ring and the jaw jaw teeth from overtightening and automatically locking.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view showing a drill chuck of the present invention with a spring ring at a threaded ring.
FIG. 2 is a detailed view of a portion II in FIG.
FIG. 3 is a cross-sectional view of a spring ring having one cam-like bulging portion on the upper surface and two stop cam-like bulging portions on the lower surface.
4 is a detailed cross-sectional view corresponding to FIG. 2, showing a state where the gripping jaw is at the limit position of its rear end in the axial direction, and the cam-like bulging portion of the spring ring is inserted into the cam-like bulging portion receiving portion; FIG.
FIG. 5 is a partial cross-sectional side view corresponding to FIG. 1 of the drill chuck showing the threaded ring pressed and supported axially rearwardly through a spring-flexible thrust ring; FIG.
[Explanation of symbols]
1 Chuck body (main part of chuck)
3 Grasp jaw 6 Threaded ring 10 Spring ring 11 Coupling mechanism 12 Cam-shaped bulging portion 14 on the threaded ring 6 side of the spring ring 10 Cam-shaped bulged portion receiving portion 15 formed in the threaded ring 6 Stop cam-like bulge 16 on the axially forward side of the spring ring 10

Claims (8)

One chuck body (1) connectable to the drilling spindle;
A plurality of gripping jaws (3) guided in a guide receiving portion (2) extending obliquely to the chuck shaft to form a receiving portion for a drilling tool between them;
A threaded ring (6) that is rotatably guided by the chuck body (1) and meshes with a tooth row (5) formed on a jaw shaft (4) of a plurality of jaws (3) for opening and closing the drill chuck. When,
A drilling chuck comprising a spring ring (10) arranged adjacent to a drilling tool side of a threading ring (6) in the axial direction,
A spring ring (10) is rotatably mounted in the chuck body (1),
Between the thread ring (6) and the spring ring (10), when the gripping jaw (3) is in the axial rear limit position, the spring ring (10) is bent and deformed. 6) and a coupling mechanism (11) for non-rotatably connecting the spring ring (10), and
After the threaded ring (6) and the spring ring (10) are connected, means for limiting the rotation angle between the gripping jaw (3) and the threaded ring (6) is provided. And drill chuck. The drill chuck according to claim 1, wherein the coupling mechanism (11) has a cam-like bulge portion (12) on the threaded ring (6) side of the spring ring (10), and the cam-like bulge. The part (12) is a cam-shaped bulge receiving part formed on the threaded ring (6) when the gripping jaw (3) abuts against the spring ring (10) when the gripping jaw moves backward. (14) A drill chuck characterized by being capable of entering inside. 3. The drill chuck according to claim 2, wherein a plurality of cam-like bulge portions (12) and a plurality of cam-like bulge portion receiving portions (14) are provided. The drill chuck according to any one of claims 1 to 3, wherein the means for limiting the rotation angle is a stop cam-like bulge portion (15) formed on a surface facing the front in the axial direction of the spring ring (10). A drill chuck characterized by comprising: 5. The drill chuck according to claim 4, wherein several stop cam-like bulges (15) are evenly distributed over the entire circumference and are arranged corresponding to the angular distribution of the gripping jaws (3). A drill chuck characterized by that. In the drill chuck according to any one of claims 1 to 5,
A threaded ring (6) is supported from the chuck body (1) via a thrust ring (16) on the axially rear side, ie on the drilling spindle side,
The thrust ring (16) abuts the main body shoulder (18) of the chuck body (1) facing forward in the axial direction, and the transverse dimension of the main body shoulder (18) is in the radial direction with respect to the thrust ring (16). From the above, a drill chuck characterized in that the maximum overlap is 50%. The drill chuck according to claim 6, wherein the transverse dimension of the main body shoulder (18) overlaps the thrust ring (16) up to 25% of the maximum. 8. The drill chuck according to claim 6 or 7, wherein a sliding surface for the ball (17) of the ball bearing (19) is formed on the opposite side of the thrust ring (16) and the threaded ring (6). A drill chuck characterized by being made.

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